Question: Can you name the J.K. Rowling book that has sold the least copies?
Paraphrase: Which of J.K. Rowling's books has been purchased the least?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q7725634 . ?ent wdt:P2664 ?obj . ?ent wdt:P50 wd:Q34660} ORDER BY ASC(?obj)LIMIT 5 
Answer: Harry Potter and the Philosopher's Stone